linux-kernel - Re: [PATCH v6 1/9] kernel: Support TIF_SYSCALL

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Message-ID: <20200911093221.GD1362448@hirez.programming.kicks-ass.net>
Date:   Fri, 11 Sep 2020 11:32:21 +0200
From:   peterz@...radead.org
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     luto@...nel.org, tglx@...utronix.de, keescook@...omium.org,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, willy@...radead.org,
        linux-kselftest@...r.kernel.org, shuah@...nel.org,
        kernel@...labora.com
Subject: Re: [PATCH v6 1/9] kernel: Support TIF_SYSCALL_INTERCEPT flag

On Fri, Sep 04, 2020 at 04:31:39PM -0400, Gabriel Krisman Bertazi wrote:
> +static inline void __set_tsk_syscall_intercept(struct task_struct *tsk,
> +					   unsigned int type)
> +{
> +	tsk->syscall_intercept |= type;
> +
> +	if (tsk->syscall_intercept)
> +		set_tsk_thread_flag(tsk, TIF_SYSCALL_INTERCEPT);
> +}

Did the above want to be:

	unsigned int old = tsk->syscall_intercept;
	tsk->syscall_intercept |= type;
	if (!old)
		set_tsk_thread_flag(tsk, TIF_SYSCALL_INTERCEPT)

?

> +static inline void __clear_tsk_syscall_intercept(struct task_struct *tsk,
> +					     unsigned int type)
> +{
> +	tsk->syscall_intercept &= ~type;
> +
> +	if (tsk->syscall_intercept == 0)
> +		clear_tsk_thread_flag(tsk, TIF_SYSCALL_INTERCEPT);
> +}